One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(5,6)(7,11)(8,9)(10,12)(13,14,18,22)(15,19,25,28)(16,26,24,20)(17,27,23,21)(1,2,4,3)(5,6)(7,10)(8,9)(11,12)(13,15)(14,19)(16,17)(18,25)(20,21)(22,28)(23,24)(26,27)(6,9)(10,11)(13,15,23,16,18,25,17,24)(14,20,27,28,22,26,21,19)(5,7,8,12)(6,10,9,11)(13,16,23,25,18,24,17,15)(14,19,27,20,22,28,21,26)(1,3,4,2)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.